apply the new design system to the home page: wrap content in a
container/stack shell with a site-header for the logout and today
links, render the texts list as a vertical stack of cards via the
list-cards primitive, and dress the create plan modal with the new
modal/btn classes. js renders each text as an li.card with the
create-plan button preserved so existing cypress hooks (li,
.create-plan, .plan-name, .save-plan, .cancel-plan, ids) keep
matching.
add a stylesheet link and the standard responsive viewport meta tag
to every page template. purely additive - no markup or selector
changes - so existing cypress assertions and page js id hooks remain
intact. with this commit every page picks up the base styling from
app.css.
